AD/Exchange user account does not show up in EV

One of our Exchange 2003 users has his mailbox and AD account set up correctly. When I use the EV Management console to enable his mailbox it does not show up in the available mailboxes. I look in the list of Exchange mailboxes and his name does not appear there either. The guy clearly has a mailbox and AD account which are working well but somehow EV has not picked it up. Can I correct this manually somehow or do I have to scrap his account and create a new one?

Is the user in a provisioning group? Has provisioning been ran in normal mode?

You can set the provisioning report to be full and then do a run now. This will generate a report in the Report folder in the EV install directory. Look at the report to see if you can find the user in there.

After provisioning runs you should synchronize the mailboxes and then see if the mailbox show to be enabled.